I see what you mean. The Damascus looks a little finer in the pictures you show. Took me awhile to figure out how to post the pictures, but as you can see it does have the 12B and 13M markings. Very interesting, this is the most info I've been able to gather about this gun. I'm sure you're right about the dates also, it's been awhile since I looked it up in that proof mark book. My brother bought it at a "tag sale" in Mass. many years ago. I don't think he paid much for it. He'll be pleased to hear all this. As I said I'm not looking to sell it but what do you suppose it's worth? Thanks again.